Montgomery County Fire and Rescue spokesman Pete Piringer says one of the juveniles was taken to the hospital with minor burns and possible smoke inhalation. News outlets report the fire was discovered Tuesday night near North Bethesda Middle School.

Piringer says the about 400-foot (122-meter) storm drain was searched when another juvenile was unaccounted for. The second juvenile eventually showed up, and was also taken to the hospital for smoke inhalation.

Officials say liquids were discovered that may have been flammable during the search of the tunnel.